It won't be right to criticise Pep Guardiola, who won three consecutive Bundesliga titles during his time at the Allianz Arena, says Bayern Munich chairman Karl-Heinz Rummenigge.
Rummenigge says the former Barca and Bayern coach Guardiola is not at fault for Manchester City's below par display this season.
The Bayern supremo believes the lack of quality in the City side is a factor as to why they are currently fifth in the Premier League table and they would need to enter the transfer market to improve the squad.
"You cannot blame Pep for anything. Manchester City will be patient," Rummenigge told Bild.
"They have no other option but to enter the transfer market and bring in some quality players in order to give Pep the chance to be successful.
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"There is not as much individual quality at Manchester City as at Barcelona or Bayern."
Rummenigge also said the Bundesliga champions are not looking to sell any of their players to the Citizens.
"We will keep all our best players here and not allow anyone to leave," he added.
"We have the same goals as Real Madrid, Barcelona, Chelsea and Juventus and we need our best players to achieve those goals. Money is not important."
He continued: "Things have become much more difficult in England because all clubs have invested a lot of money.
"And things are more complicated at Manchester City than at Barcelona and Bayern Munich. There is a different football culture in England. It is much more physical and all about kick and rush. That makes it hard to stick to Pep's philosophy."